Initial structure and basic funtions

* Create initial repository structure
* Add gerritPatchsetCheckout and runTox global functions

Change-Id: I3c716e12dec76bb405d33501bc260425419814be
diff --git a/vars/gerritPatchsetCheckout.txt b/vars/gerritPatchsetCheckout.txt
new file mode 100644
index 0000000..4575695
--- /dev/null
+++ b/vars/gerritPatchsetCheckout.txt
@@ -0,0 +1,6 @@
+// Usage example
+node {
+  gerritPatchsetCheckout{
+    credentialsId = "credentials-id-string"
+  }
+}